Crossword Clue:

to explore caves

AnswerCrossword Clue
SPELUNKExplore caves
CAVESHole worlds to explore
RILLEValley for an astronaut to explore
DEEPSEAExtremely difficult-to-explore part of Earth
LEMAux. craft used to explore on moon
ANTRESCaves, to poets
ABODESCaves, to early man
DENSCaves as places to hide.